From 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 Mon Sep 17 00:00:00 2001
From: prashantsinalkar
Date: Tue, 10 Oct 2017 12:27:19 +0530
Subject: initial commit / add all books

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+//Book Name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi
+//chapter 7
+//example 7.5
+//edition 1
+//publisher and place:Nelson Engineering
+clc;
+clear;
+V=480;//terminal voltage in volt
+p=6;//number of poles
+Pout=30*746;//output power interms of watt
+f=60;//frequency in hertz
+R1=0.5;//stator resistance in ohm
+R2=0.5;//rotor resistance reffered to stator in ohm
+ns=1200;//synchronus speed in rpm
+rps=ns/60;
+omegas=(2*%pi*rps);//angular synchronous speed
+Td=120;//load torque constant
+s=(Td*omegas*R2)/V^2;
+n=ns*(1-s);//the speed at full voltage in rpm
+n=ceil(n)
+Vnew=0.8*V;//when voltage is reduced by 20%
+snew=(V^2*s)/Vnew^2;//new slip after the reduction of 20% of the rated voltage
+nnew=ns*(1-snew);//new speed of the motor in rpm
+nnew=ceil(nnew)
+mprintf("The speed of the motor after the reduction of the rated voltage is %d rpm",nnew)
-- 
cgit